Variable Interest Entities (Assets And Liabilities Of Vacation Ownership SPEs) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Transfer And Financial Assets [Line Items]
Securitized contract receivables, gross	$ 2,777	$ 2,710
Total assets	9,819	9,591	$ 9,568
Total liabilities	9,101	8,638
Securitized contract receivables, net, current	262	272
Securitized contract receivables, net, non-current	2,515	2,438
Securitized restricted cash, current	75	73
Vacation Ownership SPEs [Member]
Schedule Of Transfer And Financial Assets [Line Items]
Securitized contract receivables, net, current	235	248
Securitized contract receivables, net, non-current	2,254	2,214
Securitized restricted cash, current	75	73
Securitized restricted cash, non-current	15	19
Deferred financing cost related to securitized debt	24	24
Securitized conduit facilities, current	195	209
Securitized conduit facilities, long-term	1,946	1,897
Variable Interest Entity, Primary Beneficiary [Member]
Schedule Of Transfer And Financial Assets [Line Items]
SPE assets in excess of SPE liabilities	461	471
Variable Interest Entity, Primary Beneficiary [Member] | Vacation Ownership SPEs [Member]
Schedule Of Transfer And Financial Assets [Line Items]
Securitized contract receivables, gross	2,489	2,462
Securitized restricted cash	90	92
Interest receivables on securitized contract receivables	21	20
Other assets	4	5
Total assets	2,604	2,579
Securitized term notes	1,857	1,867
Securitized conduit facilities	284	239
Other liabilities	2	2
Total liabilities	2,143	2,108
SPE assets in excess of SPE liabilities	$ 461	$ 471